Downloading docker image for transfer to non-internet-connected machine

Short: use the save CLI command. https://docs.docker.com/engine/reference/commandline/save/ You can pull the image on a computer that have access to the internet. sudo docker pull ubuntu Then you can save this image to a file sudo docker save -o ubuntu_image.docker ubuntu Transfer the file on the offline computer (USB/CD/whatever) and load the image from the file: … Read more

Multiple commands in Docker CMD directive

I believe the difference might be because the second command does shell processing while the first does not. Per the official documentation, there are the exec and shell forms. Your first command is an exec form. The exec form does not expand environment variables while the shell form does. It is possible that by using … Read more

IP addresses to block to stop WP auto-update?

You don’t need to block the IP address at all. Append this code in wp-config.php of your website in case you have access to it:: define(‘WP_AUTO_UPDATE_CORE’, false); Alternative Method This will hide update messages for all kind of users:: Add this function to your functions.php function hide_update_notice_to_all_but_admin_users() { if (current_user_can(‘read’)) { remove_action( ‘admin_notices’, ‘update_nag’, 3 … Read more

How do I auto-start docker containers at system boot?

Apparently, the current method to auto-start Docker containers (from Docker 1.2) is to use restart policies. This will control how Docker should handle starting of the container upon startup and re-starting of the container when it exits. I’ve used the ‘always’ option so far, and can confirm that it makes Docker auto-start the container at … Read more